特徵描述
作者
LIAO, JIH-CHING
型態特徵
Monoecious deciduous trees and shrubs. Leaves alternate, simple, straight-veined, petioled; stipules fugacious. Staminate flowers in long pendulous catkins, 1–6 clustered together in axils of bracts; calyx 2–4, parted or not; stamens 2–20; pistillate flowers in short lateral or capitate catkins, with or without calyx, adnate to the ovary; ovary 2-celled, each cell with 1 ovule; style 2-parted. Fruit a nut or samara, indehiscent, 1-celled, 1-seeded.
屬
Six genera and about 150 species mostly in the northern hemisphere, some planted for ornament and others for the edible nuts.
參考文獻
Carpinus 千金榆屬
作者
LIAO, JIH-CHING
型態特徵
Deciduous trees or shrubs; bark smooth, gray; winter buds conspicuous, acute, with many imbricate scales. Leaves somewhat 2-ranked, serrate, plicate, 7–24-penninerved, often cordate. Staminate catkins pendulous, enclosed in buds during the winter, sessile near the ends of short lateral branches; flowers solitary in axil of each bract, without calyx, stamens 3–13, filaments 2-forked. Pistillate spikes terminal on leafy branches, erect, each bract bearing 2 flowers; calyx limb minute, superior, 6–10-dentate; ovary 2-celled, each cell 1-ovuled; style arms 2, long stigmatose on inner surface. Nuts ovoid, acute, subtended at base by a 3-lobed or dentate elongate foliaceous bract and bracteoles, 1-seeded.
